Question

Why do we add chemical iodine
solution while preparing onion peel mount ?
​

Answer 1

Answer:

Iodine is used in staining cells of an onion peel on the slide due to following reason. *Onion bulb is made up of scaly leaves which store starch granules in their cytoplasm of the cells. *Iodine binds to starch in the granules and develops blue black colour.

Explanation:

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Answer 2

Given that iodine tends to bind to starch, it stains the starch granules when the two come in to contact making them visible. Although onions may not have as much starch as potato and other plants, the stain (iodine) allows for the little starch molecules to be visible under the microscope.

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